<title>银河英雄传说</title><link href="http://hzoi.com/tomorrow.css" rel="stylesheet"><div class="ui existing segment"><pre><code><span class="pl-cp">#include</span><span class="pl-cpf">&lt;cstdio&gt;</span><span class="pl-cp"></span>
<span class="pl-cp">#include</span><span class="pl-cpf">&lt;cmath&gt;</span><span class="pl-cp"></span>
<span class="pl-k">using</span> <span class="pl-k">namespace</span> <span class="pl-n">std</span><span class="pl-p">;</span>
<span class="pl-kt">int</span> <span class="pl-n">n</span><span class="pl-p">,</span><span class="pl-n">p</span><span class="pl-p">,</span><span class="pl-n">q</span><span class="pl-p">,</span><span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-mi">300001</span><span class="pl-p">];</span>
<span class="pl-kt">char</span> <span class="pl-n">c</span><span class="pl-p">;</span>
<span class="pl-kt">int</span> <span class="pl-nf">read</span><span class="pl-p">()</span> <span class="pl-p">{</span>
	<span class="pl-kt">int</span> <span class="pl-n">num</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">,</span> <span class="pl-n">flag</span> <span class="pl-o">=</span> <span class="pl-mi">1</span><span class="pl-p">;</span> <span class="pl-kt">char</span> <span class="pl-n">c</span> <span class="pl-o">=</span> <span class="pl-n">getchar</span><span class="pl-p">();</span>
	<span class="pl-k">for</span><span class="pl-p">(;</span> <span class="pl-n">c</span> <span class="pl-o">&lt;</span> <span class="pl-sc">&#39;0&#39;</span> <span class="pl-o">||</span> <span class="pl-n">c</span> <span class="pl-o">&gt;</span> <span class="pl-sc">&#39;9&#39;</span><span class="pl-p">;</span> <span class="pl-n">c</span> <span class="pl-o">=</span> <span class="pl-n">getchar</span><span class="pl-p">())</span>
		<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">c</span> <span class="pl-o">==</span> <span class="pl-sc">&#39;-&#39;</span><span class="pl-p">)</span> <span class="pl-n">flag</span> <span class="pl-o">=</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
	<span class="pl-k">for</span><span class="pl-p">(;</span> <span class="pl-n">c</span> <span class="pl-o">&gt;=</span> <span class="pl-sc">&#39;0&#39;</span> <span class="pl-o">&amp;&amp;</span> <span class="pl-n">c</span> <span class="pl-o">&lt;=</span> <span class="pl-sc">&#39;9&#39;</span><span class="pl-p">;</span> <span class="pl-n">c</span> <span class="pl-o">=</span> <span class="pl-n">getchar</span><span class="pl-p">())</span>
		<span class="pl-n">num</span> <span class="pl-o">=</span> <span class="pl-p">(</span><span class="pl-n">num</span><span class="pl-o">&lt;&lt;</span><span class="pl-mi">3</span><span class="pl-p">)</span><span class="pl-o">+</span><span class="pl-p">(</span><span class="pl-n">num</span><span class="pl-o">&lt;&lt;</span><span class="pl-mi">1</span><span class="pl-p">)</span><span class="pl-o">+</span><span class="pl-n">c</span><span class="pl-o">-</span><span class="pl-mi">48</span><span class="pl-p">;</span>
	<span class="pl-k">return</span> <span class="pl-n">flag</span><span class="pl-o">?</span> <span class="pl-nl">num</span><span class="pl-p">:</span> <span class="pl-o">-</span><span class="pl-n">num</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">int</span> <span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-mi">300010</span><span class="pl-p">],</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-mi">300010</span><span class="pl-p">];</span>
<span class="pl-kt">int</span> <span class="pl-nf">getfather</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">x</span><span class="pl-p">)</span> <span class="pl-p">{</span>
	<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">x</span><span class="pl-o">==</span><span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">])</span> <span class="pl-k">return</span> <span class="pl-n">x</span><span class="pl-p">;</span>
	<span class="pl-kt">int</span> <span class="pl-n">root</span><span class="pl-o">=</span><span class="pl-n">getfather</span><span class="pl-p">(</span><span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]);</span>
	<span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]</span><span class="pl-o">+=</span><span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]];</span>
	<span class="pl-k">return</span> <span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">root</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
<span class="pl-kt">void</span> <span class="pl-nf">merge</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">x</span><span class="pl-p">,</span><span class="pl-kt">int</span> <span class="pl-n">y</span><span class="pl-p">)</span> <span class="pl-p">{</span>
	<span class="pl-n">x</span><span class="pl-o">=</span><span class="pl-n">getfather</span><span class="pl-p">(</span><span class="pl-n">x</span><span class="pl-p">),</span><span class="pl-n">y</span><span class="pl-o">=</span><span class="pl-n">getfather</span><span class="pl-p">(</span><span class="pl-n">y</span><span class="pl-p">);</span>
	<span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">y</span><span class="pl-p">;</span><span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">y</span><span class="pl-p">];</span>
	<span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">y</span><span class="pl-p">]</span><span class="pl-o">+=</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">x</span><span class="pl-p">];</span>
<span class="pl-p">}</span>

<span class="pl-kt">int</span> <span class="pl-nf">main</span><span class="pl-p">()</span> <span class="pl-p">{</span>
	<span class="pl-n">n</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">();</span>
	<span class="pl-k">for</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">&lt;=</span><span class="pl-mi">300000</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-n">fa</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-n">i</span><span class="pl-p">,</span><span class="pl-n">size</span><span class="pl-p">[</span><span class="pl-n">i</span><span class="pl-p">]</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span>
	<span class="pl-k">for</span><span class="pl-p">(</span><span class="pl-kt">int</span> <span class="pl-n">i</span><span class="pl-o">=</span><span class="pl-mi">1</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">&lt;=</span><span class="pl-n">n</span><span class="pl-p">;</span><span class="pl-n">i</span><span class="pl-o">++</span><span class="pl-p">)</span> <span class="pl-p">{</span>
		<span class="pl-n">c</span><span class="pl-o">=</span><span class="pl-n">getchar</span><span class="pl-p">();</span><span class="pl-n">p</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">();</span><span class="pl-n">q</span><span class="pl-o">=</span><span class="pl-n">read</span><span class="pl-p">();</span>
		<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">c</span><span class="pl-o">==</span><span class="pl-sc">&#39;M&#39;</span><span class="pl-p">)</span> <span class="pl-n">merge</span><span class="pl-p">(</span><span class="pl-n">p</span><span class="pl-p">,</span><span class="pl-n">q</span><span class="pl-p">);</span> 
		<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">c</span><span class="pl-o">==</span><span class="pl-sc">&#39;C&#39;</span><span class="pl-p">)</span> <span class="pl-p">{</span>
			<span class="pl-k">if</span><span class="pl-p">(</span><span class="pl-n">getfather</span><span class="pl-p">(</span><span class="pl-n">p</span><span class="pl-p">)</span><span class="pl-o">!=</span><span class="pl-n">getfather</span><span class="pl-p">(</span><span class="pl-n">q</span><span class="pl-p">))</span> <span class="pl-n">puts</span><span class="pl-p">(</span><span class="pl-s">&quot;-1</span><span class="pl-se">\n</span><span class="pl-s">&quot;</span><span class="pl-p">);</span>
			<span class="pl-k">else</span> <span class="pl-p">{</span>
				<span class="pl-kt">int</span> <span class="pl-n">ans</span><span class="pl-o">=</span><span class="pl-n">abs</span><span class="pl-p">(</span><span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-n">p</span><span class="pl-p">]</span><span class="pl-o">-</span><span class="pl-n">d</span><span class="pl-p">[</span><span class="pl-n">q</span><span class="pl-p">])</span><span class="pl-o">+</span><span class="pl-mi">1</span><span class="pl-p">;</span>
				<span class="pl-n">printf</span><span class="pl-p">(</span><span class="pl-s">&quot;%d</span><span class="pl-se">\n</span><span class="pl-s">&quot;</span><span class="pl-p">,</span><span class="pl-n">ans</span><span class="pl-o">-</span><span class="pl-mi">2</span><span class="pl-p">);</span>
			<span class="pl-p">}</span>
		<span class="pl-p">}</span>
	<span class="pl-p">}</span>
	<span class="pl-k">return</span> <span class="pl-mi">0</span><span class="pl-p">;</span>
<span class="pl-p">}</span>
</cpde></pre></div>